Breaking news reporter

Sydney police are investigating death threats made against Mel Greig and Michael Christian, the 2Day FM DJs who made the royal hoax call that may have contributed to the suicide of a British nurse.

Eastern Suburbs detectives seized a letter on Thursday afternoon "which contained a number of threats", a police spokeswoman said.

Police would not detail the nature of those threats, or confirm reports that the letter stated there were "bullets out there with your [Christian’s] name on it".

Other threats involving a shotgun were reportedly made in the letter, believed to have originated in South Australia.

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A police spokeswoman said detectives were attempting to identify the author of the letter, and urged anyone with information about it to contact police.

Detectives are holding discussions with the radio station’s management, the spokeswoman said, but she could not comment on reports that Southern Cross Austereo had moved about a dozen staff into hotels and hired bodyguards for executives in the wake of the suspected suicide of British nurse Jacintha Saldanha.

A spokeswoman for Southern Cross Austereo would not detail any measures the company had taken to protect staff, only saying that "the safety of our employees is an absolute priority".

"We have sensible measures in place, as we always do, to ensure our people are safe," she said.

"This is now a matter for the police and we trust they will investigate any specific threats that emerge."

During a brief hearing in London on Thursday morning (local time), Westminster Coroner’s Court was told Ms Saldanha, 46, was found dead at staff quarters near King Edward VII hospital where she worked.

The mother-of-two was duped by the Australian DJs making a hoax call to the hospital seeking details about Prince William’s pregnant wife Catherine, who was receiving treatment for acute morning sickness.

The coronial hearing was also told investigators found three notes, handwritten by Ms Saldanha.The London inquest has been adjourned until March 26 next year

Anyone with information about the death threats made to the the 2Day FM DJs should call Crime Stoppers on 1800 333 000.

* Support is available for anyone who may be distressed by calling Lifeline 131 114, Mensline 1300 789 978, Kids Helpline 1800 551 800.